I think a good sequel to GOTS might be set about 5-10years after the events in Part 1. In this novel, other than the AK-47's and technology which could have been back engineered from these, very little modern technology has been widely introduced. As Stratego's Risk suggests, the CSA has set up a very secret research institute to study the modern technology and control it's introduction into the world. The existence of time travel is hidden. The novel would be set, not in the CSA, but in either the USA or Britain, and focus on the gradual discovery by US or British intellegence services that something might be very unusual in the CSA. It becomes essentially a spy novel as attempts are made to discover the truth behind the sudden CSA technological innovations. Perhaps this eventually prompts a brief war between the US and/or UK and the CSA in which the Southerners get to trot out some additional super-tip-top-secret future stuff. War spins out of control, CSA and Afrikanners have a complete falling out, CSA is eventually deferated, pandoras box is opened and world goes even more to hell in a handbasket.